Question

1.What is the transmission medium for wireless networks?

2.What is the difference between half-duplex mode and full-duplex mode?

3.What are the main differences between a hub and a switch? What makes a switch a better choice?

4.Which device would you use to connect two network segments with different subnet addresses?

5. Which device connects hosts using different transmission media on the same subnet?

6.Which type of server handles user authentications?

7.What is the role of a DHCP server?

8. What are the benefits of using Internet appliances?

Answer 1

1)  Air or vacuum

Wireless signals are electromagnetic waves that can travel through the vacuum of outer space and through a medium such as air. No physical medium is necessary for wireless signals.

2)

Half Duplex

With half duplex Sender is able to send the data and also can receive the data but one at a time. It is bi-directional communication but one at a time.

Full Duplex

With full duplex, simultaneously, sender can send the data and also can receive the data. It is bi-directional communication simultaneously.

3)

Hub

It is a network device operating in the physical layer. It is used to connect multiple devices in a network.

It is a non-intelligent network device that sends message to all ports.

Switch

It is a network device that operates in the Data Link layer.

when a data frame arrives at any port of a network switch, it examines the destination address and sends the frame to the corresponding device(s). Thus, it supports both unicast and multicast communications.

Switch is better choice because it is an intelligent device, supports packet filtering, provides full duplex and have more number of ports compared to hub.

4)

A Router is used to connect two network segments with different subnet address.

It is a network device that connects one network to another.

5)

Bridge connects hosts using different transmission media on the same subnet.

It creates a single aggregate network from multiple communication networks or network segments.

6)

Authentication server

It allows a network service that applications use to authenticate the credentials, typically user names and passwords. When a client submits a valid set of credentials, it receives a cryptographic ticket that it can subsequently use to access various services.

7)

A DHCP server dynamically assigns an IP address and other network configuration parameters to each device on a network so they can communicate with other IP networks.

8)

The benefits of internet devices are:

Better quality of life : increases comfort and convenience.

Saves Money : optimum usage of power.

Automation of daily tasks

Communication between devices

Monitoring of devices

Summary

questions 1-8 answered.